Is there a way in Dorico to make arpeggio signs invisible? I want my harp to have arpeggios in playback, but I don’t want arpeggio signs to be in the score as the player would know to roll chords slightly.
Yes, this can be done. Input the arpeggio symbol, then select it. Go to Properties and scale it to, say 2 - it won’t appear, but will still playback correctly.
You could also produce the effect you want in playback without any notation by changing the played durations of the notes in Play mode (v3.5 and earlier) or in the key editor (v4).
For an example, see here.